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To characterize the times of the 50s and 60s, the author must have used a series of adjectives that not only show the characteristics of that time but also reinforce the similarities and differences between them. In this case, we can say that the author characterizes these two epochs through a descriptive language that presents these two epochs in a specific and punctual way.
They should appear in order as they are cited within the essay. If you have a citation in the first paragraph, a citation in the second, and a citation in the third, it should be in chronological order of your citations (not chronological as in year/date of publications)